In this paper, the system assessment theory of he concrete filled steel tubular arch bridge which is based on the theory of the reliability of system reliability is researched through the finite element analysis software ANSYS. Because the concrete filled steel tube arch bridge has the characteristics, such as the components numerous, complex forces, unable to list the of the explicit limit state equation, so use the probability design module of ANSYS (PDS) technology for the performance evaluation of the concrete filled steel tubular arch bridge with the combination of the reliability theory of monte carlo (MC) method, the response surface method (RSM) and the equivalent normal distribution method (JC method).According to the measured data and documents, selecte the random variables which have a large influence on structure reliability as the input parameters and use APDL language to write the structural response’s parameterized model of concrete filled steel tubular arch bridge. Then fit the response surface equation and get its statistical sampling parameters, and finally using Matlab program based on JC method to calculate the reliability index of the components. According to the structure characteristics of concrete filled steel tube arch bridge, the whole structure is as a series of arch rib series, derrick, floor system, selection of components of the minimum reliability index as the system's reliability index.

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The Performance Evaluation of Concrete Filled Steel Tubular
Arch Bridge
Ma Wei-long
(School of Civil Engineering and Architecture, Chongqing Jiaotong University, Chongqing 400074, China)
Abstract
In this paper, the system assessment theory of he concrete filled steel tubular arch bridge which is based on the
theory of the reliability of system reliability is researched through the finite element analysis software ANSYS.
Because the concrete filled steel tube arch bridge has the characteristics, such as the components numerous,
complex forces, unable to list the of the explicit limit state equation, so use the probability design module of
ANSYS (PDS) technology for the performance evaluation of the concrete filled steel tubular arch bridge with
the combination of the reliability theory of monte carlo (MC) method, the response surface method (RSM) and
the equivalent normal distribution method (JC method).According to the measured data and documents, selecte
the random variables which have a large influence on structure reliability as the input parameters and use APDL
language to write the structural response’s parameterized model of concrete filled steel tubular arch bridge. Then
fit the response surface equation and get its statistical sampling parameters, and finally using Matlab program
based on JC method to calculate the reliability index of the components. According to the structure
characteristics of concrete filled steel tube arch bridge, the whole structure is as a series of arch rib series,
derrick, floor system, selection of components of the minimum reliability index as the system's reliability index.
Keywords: Concrete filled steel tube arch bridge; Reliability theory; PDS technology; Performance evaluation
I. Introduction
Since 1990,when China's first concrete filled
steel tubular arch bridge--popular pale east river
bridge in Sichuan was built[1]
, the concrete filled steel
tube arch bridge in China got rapid development,
because the concrete filled steel tubular arch bridge
has advantages of high strength, convenient
construction, aesthetically pleasing, and comes at a
time when China's massive traffic infrastructure
construction period[2]
.At the same time, because the
current theory of the concrete filled steel tubular arch
bridge is not very perfect and lack of experience in
the design, on struction, operation management, the
built concrete filled steel tubular arch bridge
appeared all sorts of security Problems
which are Crisis use safety such as arch rib concrete
pavement, derrick fracture .So the performance of the
concrete filled steel tubular arch bridge evaluation
become a concerned focus in the current engineering.
At present, the concrete filled steel tubular arch
bridge safety assessment methods include
conventional comprehensive evaluation method,
Delphi expert evaluation method , the expert system
method, analytic hierarchy process (AHP) method,
grey correlation evaluation method, defect status
indicators, the artificial neural network, fuzzy
comprehensive evaluation, internal force envelope
limit evaluation method, the reliability method [3, 4]
,
and so on. But all of the evaluation methods having
advantages and disadvantages have a significant
RESEARCH ARTICLE OPEN ACCESS

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difference from the actual engineering application.
This paper introduce the performance evaluation of
concrete filled steel tube arch bridge based on the
theory of the reliability using the ANSYS PDS
Technology with the combination of the monte carlo
method, the response surface method, equivalent
normal distribution method. The calculation process
is shown in figure 1:
II. the General Situation of the
Engineering
Figure 2 is a concrete filled prestressed steel
tube concrete arc bridge, whose parameters are as
follows : arch axis is quadratic parabola ,calculation
span is 60 meters, width of bridge deck is net - 11.25
meters (driveway) + 2 x 1.3 meters (pavement),
calculation rise is 12 meters, rise-span ratio is 1/5.
Derrick spacing is 4 m, tie bar, bar for prestressed
concrete structures. The bridge panel is aside on the
beam, through the bridge deck pavement Connection
to the overall. Substructure adopts Column pier,
bored piles foundation. This bridge main technical
standards are as follows:
(1)The design load: steam - 20, hang - 100;
(2) The seismic fortification standards: 7 degrees
Figure 1 ANSYS structural reliability of steps
Figure 2: bridge elevation (unit: cm)
III. Reliability Analysis of Concrete Filled Steel Tube Arch Bridge
3.1the Determination of Random Variables According to the current research results, the
main factors influencing the structural reliability are

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the vehicle load, concrete calculation mode, steel
calculation mode, etc. The random variables[5,6,7]
for
the reliability analysis of the concrete filled steel tube
arch bridge are shown in table 1.
Table 1: characteristics probability distribution of
random variables
3.2finite element modeling
According to the bridge floor system structure,
the arch axis linear as well as the main arch rib
concrete strength data to modify the finite element
model, the resulting finite element model conforms
to the real bridge. on the choice of elements, the main
arch rib use double-cell: steel beam element--beam44
and concrete beam element-- beam44;derrick use bar
element--link10;tie rod, beams with beam element--
beam44;bridge panel use the plate
element--shell63.The bridge deck pavement and the
tie bar prestressed use equivalent load simulation and
the vehicle load adopts full bridge load in the most
unfavorable conditions. The whole bridge finite
element model is shown in figure 2.
3.3 Fitting the Response Surface and the Solution
of the Reliability Index
Limit state equation is the key to judge structure
failure or not and the foundation of reliability
assessment. In this paper, the limit state equation of
concrete filled steel tubular arch bridge are based on
concrete and steel tube of the allowable stress. Set up
the steel tube arch rib, tie rod, beam and arch rib
concrete and the limit state function of the
derrick.Then extract the two maximum stress
indicators of the concrete and steel tube the as the
failure criterions and establish the limit state
equations, The equation is as follows:
By the concrete material yield stress as a limit
state equation:
By the steel tube material yield stress as a limit
state equation:
Among them: Xi for the table 1 set of random
variables:
σcmaxrepresentation the maximum Mises stress
of concrete of arch bridge during the current
operation;
σsmaxrepresentation the maximum Mises stress
of steel tube of arch bridge during the current
operation;
[σc] representation the allowable stress of s
concrete;
[σs] representation the allowable stress of steel
tube.
Through the analysis, concrete and steel material
strength parameters affect the normal use of structure
system state significantly..So the response surface of
the structure can be fitted by them, respectively
based on the serviceability limit state equation of the
structure’s material strength. The response surface
equation are shown in table 2

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figure 2 :The finite element model
Table 2 items and the coefficient of response surface equation
Function ZG1 Function ZG2 Function ZG3 Function ZG4
constant term 1.2126e8 1.87697e7 2.30361e6 1.1778e7
X1 -8.4297e5 -1.47893e5 4.64087e4 -3.77656e4
X2 -2.41011e5 -4.2509e4 1.17151e4 2.67562e3
X3 1.19097e7 —— —— ——
X4 ——
3.1524e6 2.29261e6 3.15234e6
X5 -7.27503e6 —— —— ——
X6 ——
-1.21151e6 -2.0547e6 -1.93471e6
X7 -4.44707e6 1.97106e5 2.13361e4 5.28404e3
X8 4.37402e6 -1.51508e5 -5.17167e4 ——
X9 3.11305e6 5.52394e5 -2.27597e4 7.29534e3
X10 -2.80421e6 -4.86135e5 3.30082e5 1.41149e5
X11 -9.68864e5 -1.69645e5 1.00478e5 2.2153e4
According to the structure characteristics of the
concrete filled steel tube arc bridge, the main arch rib,
tie rod, and the structure of bridge deck structure are
as a series (Because the derricks of the bridge have
just for been replaced, which can be thought as
absolute safety status, so the tie bar for the
calculation of reliability index don’t need for
reliability analysis). Evaluated the tandem structure
characteristics, Select the structure reliability index
of the evaluation at the lowest level as the system's
reliability index. According to the front of the Matlab
program, use the JC method for the computation of
the statistical parameters of random variables. Then
obtain the results as follows: the reliable indicator of
function ZG1 (the main arch rib’s steel pipe
compression stress) is β= +∞; the reliable indicator
of function ZG2 (main arch rib concrete’s
compressive stress) is β = 35.7865; the reliable
indicator of function ZG3 (tie bar concrete
compressive stress) is β= 6.5708; the reliable
indicators of function ZG4 (beam compressive stress
of concrete) is β= 21.7993. The reliability index of
the tie bar concrete compressive stress is as bridge
upper system reliability index of concrete filled steel

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tube arch bridge, namely β=6.5708, failure
probability Pf= 2.5029e-11. According to the
highway bridge technique condition evaluation
standard [8]
and the Bridges safety level standard
based on the component [9]
, the final evaluation is for
a class of the bridge upper structure system.
IV. Conclusion
This paper introduce the performance evaluation
of concrete filled steel tube arch bridge- whose
functions are unable to list clearly- based on the
theory of the reliability using the ANSYS PDS
Technology with the combination of the monte carlo
method, the response surface method, equivalent
normal distribution method.
Evaluation results show that the bridge of the tie
bar’s reliability index is minimum, but still higher
than the lower limit of the first kind’s bridges. The
reliability indexes of the steel tube arch rib and the
concrete arch rib, concrete beams are far higher than
the lower limit of the first kind’s bridges.
Comprehensive the facts the bridge into use fixed
number of year shorter, the strength index decline not
obvious, no significant injury of actual testing results,
the bridge which is in good condition can ensure the
safety of the operation.
References
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